Process for the thermal decomposition of metal sulphates

Details Process for the thermal decomposition of metal sulphates Process for the thermal decomposition of metal sulphates

1991-07-12

1993-12-21

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423542, C01B 1750, C01B 1752

Patent

active

052719197

ABSTRACT:
A process for the thermal decomposition of metal sulphate mixtures at temperatures from 800.degree. to 1100.degree. C. under oxidizing conditions, in which the metal sulphate mixtures are mixed with roasting residue and reacted together with fuels in the decomposition reactor to form roasting residue and SO.sub.2 -containing gases from roasting wherein the roasting residue admixed with the sulphate mixture is the finely divided fraction of the resulting roasting residue which is separated from the stream of gas in an electrostatic gas purification apparatus and returned to the decomposition reactor.
This procedure has an advantageous influence on the formation of coarse roasting residue and also significantly reduces the proportion of undecomposed, water soluble sulphates in the roasting residue.

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patent: 4102989 (1978-07-01), Wheelock
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patent: 4824655 (1989-04-01), Lailach et al.
patent: 4853206 (1989-08-01), Watson
Ullmanns Encyclopaedie Der Technischen Chemie, vol. 18, 4. Auflage, 1978, pp. 579, 580, Weinheim, DE *p. 579, rechte Spalte, Zeile 58-p. 580, linke Spalte, Zeile 6*.

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